package com.thirteenClassics.aspect;

import java.lang.reflect.Method;
import java.time.LocalDateTime;
import java.util.List;

import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import com.thirteenClassics.annotation.AutoFill;
import com.thirteenClassics.constant.AutoFillConstant;
import com.thirteenClassics.context.BaseContext;
import com.thirteenClassics.enumeration.OperationType;

import lombok.extern.slf4j.Slf4j;

/**
 * 自定义切面，实现公共字段自动填充处理逻辑
 */
@Aspect
@Component
@Slf4j
public class AutoFillAspect {

    @Pointcut("execution(* com.thirteenClassicsServer.mapper.*.*(..)) && @annotation(com.thirteenClassics.annotation"
            + ".AutoFill)")
    public void autoFillPointCut() {
    }

    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint) {
        log.info("开始进行公共字段自动填充...");

        //获取到当前被拦截的方法上的数据库操作类型
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();//方法签名对象
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);//获得方法上的注解对象
        OperationType operationType = autoFill.value();//获得数据库操作类型

        //获取到当前被拦截的方法的参数--实体对象
        Object[] args = joinPoint.getArgs();
        if (args == null || args.length == 0) {
            return;
        }

        //准备赋值的数据
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();

        // 对每个参数执行自动填充逻辑
        for (Object arg : args) {
            if (arg instanceof List<?>) {
                List<?> entityList = (List<?>) arg;
                for (Object entity : entityList) {
                    fillFields(entity, operationType, now, currentId);
                }
            } else {
                fillFields(arg, operationType, now, currentId);
            }
        }
    }
    private void fillFields(Object entity, OperationType operationType, LocalDateTime now, Long currentId) {
        //根据当前不同的操作类型，为对应的属性通过反射来赋值
        if (operationType == OperationType.INSERT) {
            //为4个公共字段赋值
            try {
                Method setCreateTime =
                        entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setCreateUser =
                        entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setUpdateTime =
                        entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser =
                        entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

                //通过反射为对象属性赋值
                setCreateTime.invoke(entity, now);
                setCreateUser.invoke(entity, currentId);
                setUpdateTime.invoke(entity, now);
                setUpdateUser.invoke(entity, currentId);
            } catch (Exception e) {
                e.printStackTrace();
            }
        } else if (operationType == OperationType.UPDATE) {
            //为2个公共字段赋值
            try {
                Method setUpdateTime =
                        entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser =
                        entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

                //通过反射为对象属性赋值
                setUpdateTime.invoke(entity, now);
                setUpdateUser.invoke(entity, currentId);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}
//
//        //根据当前不同的操作类型，为对应的属性通过反射来赋值
//        if (operationType == OperationType.INSERT) {
//            //为4个公共字段赋值
//            try {
//                Method setCreateTime =
//                        entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
//                Method setCreateUser =
//                        entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
//                Method setUpdateTime =
//                        entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
//                Method setUpdateUser =
//                        entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
//
//                //通过反射为对象属性赋值
//                setCreateTime.invoke(entity, now);
//                setCreateUser.invoke(entity, currentId);
//                setUpdateTime.invoke(entity, now);
//                setUpdateUser.invoke(entity, currentId);
//            } catch (Exception e) {
//                e.printStackTrace();
//            }
//        } else if (operationType == OperationType.UPDATE) {
//            //为2个公共字段赋值
//            try {
//                Method setUpdateTime =
//                        entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
//                Method setUpdateUser =
//                        entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
//
//                //通过反射为对象属性赋值
//                setUpdateTime.invoke(entity, now);
//                setUpdateUser.invoke(entity, currentId);
//            } catch (Exception e) {
//                e.printStackTrace();
//            }
//        }
//    }
//}
